// array to store the pin no connected to A, B, C, D, E, F, G and DP
int seven_seg[] = {2, 3, 7, 8, 9, 4, 5, 6};
void setup() {
  // Defining pin modes
  for (int i = 0; i <= 8; i++) {
    pinMode(seven_seg[i], OUTPUT);
  }
}
void loop() {
  // Turn on all the segment one by one
  for (int i = 0; i <= 8; i++) {
    digitalWrite(seven_seg[i], HIGH);
    delay(500);
  }
  // Turn off all the segment at once
  for (int i = 0; i <= 8; i++) {
    digitalWrite(seven_seg[i], LOW);
  }
  delay(1000);
}